STP1191: Crack Curvature in Thin Cylinder Failure

    Fyfe, IM
    Professor and graduate student, University of Washington, Seattle, WA

    Guo, ZH
    Professor and graduate student, University of Washington, Seattle, WA

    Guo, ZK
    Graduate student, University of Washington, Seattle, WA

    Pages: 14    Published: Jan 1993


    Abstract

    An investigation was conducted on the role played by different factors on the directional stability of cracks in pressurized thin-walled cylinders under fatigue loading conditions. In addition to internal cyclic pressure, the test system was designed to allow axial loads to be applied independently. Fractional factorial design techniques were used to determine the interaction between a number of different parameters which could possibly control the crack path direction.

    This statistical analysis shows the importance of the key experimental parameters and the interaction of these parameters on the crack path. It also serves to show that, although crack length and pressure control the bulge characteristics, a symmetric bulge in itself only plays a part in determining the stability of the crack path but not the direction. Another aspect of the study was examining the possible mechanisms which control the direction taken by an inherently unstable crack and the effect these mechanisms could have on the KII/KI ratio associated with the theoretical models of crack growth direction.

    Keywords:

    fatigue (materials), crack stability, thin cylinder, factorial design, fracture mechanics


    Paper ID: STP24812S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP24812S


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